Goodday Everyone, im planning to buy my first car. it really doesn't matter kung anu model or kung luma sya or outdated. im looking for the most fuel efficient car possible. i knew it will depends on how the car was maintained but if every model is in good condition which brand and variant is the most fuel efficient that will fit in my budget.

note: i will use this for long drive with my wife and baby. madalas mag SLEX kami so im willing to turn off my aircon on highway.
again ang budget ko is 150k. should i consider converting car to LPG?

let says all of them are in good condition and same driving style applied

Help. car newbie at hindi gaanung mayaman
please post the model variant and its fuel consumption

GODBLESS to all.. :D